Furnace grate



2 Sheets-Shea?) 1 TIIIIIII Illlllil W. SCHELLENBERG Dec. 9, 1 924.

FURNACE GRATE Filed Aug. l 1922 Dec. 1924 1,518,364

W. SCHELLENBERG FURNACE GRATE Filed Aug. 1, 1922 2 Sheets-Sheet 2Qwwenfor:

Patented Dec. 9, 1924,

UNITED STATES WALTHER SCHELLENBERG, 0F BARMEN-RITTERSHAUSEN, GERMANY.

FURNACE GRATE.

Application filed August 1, 1922.

To all whom it may concern.-

Be it known that I, VALJHER SCHELLEN- nuns, a citizen of Germany,residing at Barmen-Rittershausen, Germany, have invented certain new anduseful Improvements in Furnace Grates, of which the following is aspecification.

My invention relates to furnace grates and more especially to grates ofthe kind in which transverse grate bars provided with openings arearranged in a series in such manner that they form longitudinal passagesor channels with slots leading to the furnace.

It is an object of the present invention to increase the grate bars inheight a little in front of the furnace bridge, the slots formed bythese grate bars having a. direction opposite to that of the draught ofthe furnace gases. By this means the introduction of jets of steam andair ordinarily employed in connection with other kinds of grates andacting in the opposite direction to the fuel gases may be readilycarried out by making use of grates of the type mentioned provided withtransverse grate bars.

The drawings illustrate, by way of example, a form of embodiment of theinvention as applied to a double flue boiler, in which Figure 1represents an end elevation and Figure 2 represents a longitudinalsection.

Figures 3 to 6 show further forms of construction according to theinvention in longitudinal or cross-section, respectively.

Referring to the drawings, the grate consists of the usual grate bars aarranged in a series transversely to the longitudinal direction of thefurnace, the bars forming groups of air passages 7), whence slots 0,preferably substantially fan-shaped, lead to the surface of the grate.According to the invention the grate bars near the furnace bridge cl areso shaped that their upper surfaces rise towards the furnace bridge 0?.The slots 0 in this part of the grate are curved in such a way that thejets or currents of steam or air passing through them are directed awayfrom the furnace bridge, that is oppositely to the direction of flow ofthe fuel gases.

In order to regulate the admission of the air or steam to the grate, ortoenable sections of the grate to be completely closed against theadmission of air, control nozzles f are provided upon the steam inletpipe 0 Serial No. 578,994.

in front of each passage Z), and by means of which the quantity of steamor air admitted may be adjusted in accordance with the fuel conditions.

In the construction shown in Figure 3 the grate consists, as in theconstruction according to Figures 1 and 2, of grate bars a arranged in aseries transversely to the longitudinal direction of the furnace, thegrate bars forming air passages I), from which fan-shaped or elongatedlanceolate slots extend to the surface of the grate. The upwardlysloping end f of the grate, adjacent the furnace bridge cl, is made inone piece as differentiated from the construction according to Fig. 2,which simplifies very considerably the manufacture and the mounting andremoval of this part of the grate. The upwardly directed slots 0provided in this block f are straight. The longitudinal passages of theblock f are connected by short transverse passages 9, so that, upon thepassage of the air to one or other of the longitudinal passages b beinginterrupted, the rear part of the grate nevertheless received air fromthe other longitudinal passages along its whole width.

In the construction according to Figure 4 the grate bars are providedwith separate passages cl, through which the air may pass, if inconsequence of the energy produced by the current of combustion airpassing through the passages Z) the air becomes rarefied and the processof combustion in the forward part of the grate is thus prejudiciallyinfluenced. By the arrangement of the passages cl, which are preferablynozzleshaped, it becomes possible to regulate the process of combustionin the forward part of the grate to the greatest possible extent.

Figures 5 and 6 show in cross-section and in plan View respectively aspecial forma tion of the end f of the grate which is adjacent tothefurnace bridge. The grate bars a in this modification are not formed inone piece with the block 7, but are distinct from the block and areloosely inserted into the block from above. This arrangement has theadvantage that it is possible to readily insert and withdraw damagedgrate bars without the necessity of disassembling the entire block.

The invention is susceptible of various other modifications andalterations both in the construction as well as in the arrangement ofparts in order to adapt the invention to a variety of different uses andto suit varying operating conditions, and Without deviating from thespirit of the invention as set forth and defined in the claims ashereunto appended.

I claim 1. A furnace comprising a grate and bars forming said grate andextending transversely thereof, said bars having lateral excavations anda plurality of transverse openings, the excavations of contiguous barsforming transverse slots opening into the upper surface of the grate,While the openings of the several bars register With each other and formlongitudinal passages extending transversely to and communicating withsaid slots and a plurality of simi lar bars increasing in heightarranged at the end of said grate, the longitudinal passages in saidlatter bars being interconnected by transverse passages.

2. A furnace comprising a grate and bars forming said grate andextending transversely thereof, said bars having lateral excavations anda plurality of transverse openings, the excavations of contiguous barsforming transverse slots opening into the upper surface of the grate,While the openings of the several bars register with each other and formlongitudinal passages extending transversely to and communicating withsaid slots auxiliary ports extending through the bottom portion of saidgrate into said passages, and a plurality of similar bars increasing inheight arranged at the end of said grate, the longitudinal pas sages insaid latter bars being iutercmiueeted by transverse passages.

In testimony whereof I aflix my signature VALTHER- SCHELLENBERG.

